RESUMEN
The occurrence of 58 pharmaceutically active compounds (PhACs) in surface water at 28 coastal and five river sites, and in two stormwater flows in Cape Town, South Africa, was investigated in winter and summer. After accounting for quality assurance and control data, 33 PhACs were considered in detail. In winter, 25 PhACs were found at one or more sites and 27 in summer. Salicylic acid was the most widespread PhAC in each season. At least one PhAC was found at each site in each survey. The largest number found at a site was 22 at Lifebox23 Beach in winter and 23 at Macassar Beach and in the Black and Diep Rivers in summer. These sites are strongly directly or indirectly affected by wastewater treatment plant discharges. The range in ΣPhAC concentrations was 41 ng L-1 to 9.3 µg L-1 in winter and 109 ng L-1 to 18.9 µg L-1 in summer. The hazard posed by PhACs was estimated using Predicted No Effect Concentrations (PNEC) from several sources. Hazard Quotients (HQs) for numerous PhACs were >1, and for several even >10, including azithromycin, cimetidine, clarithromycin, erythromycin, and ibuprofen. The highest hazards were at coastal sites strongly indirectly affected by wastewater treatment plant discharges. Azithromycin, trimethoprim, and sulfamethoxazole at some sites may have promoted antibiotic resistance in bacteria, while irbesartan at some sites might have posed a hazard to fish according to the fish plasma model. The concentrations of several PhACs at some coastal sites are higher than concentrations reported in estuarine, coastal, and marine waters in other parts of the world.
Asunto(s)
Monitoreo del Ambiente , Contaminantes Químicos del Agua , Sudáfrica , Contaminantes Químicos del Agua/análisis , Preparaciones Farmacéuticas/análisis , Agua de Mar/química , Ríos/química , Aguas Residuales/química , Estaciones del AñoRESUMEN
BACKGROUND: The PA skills of phonological blending and segmentation and auditory word discrimination relate directly to literacy and may be weak in English second language (EL2) learners. In South Africa, literacy skills have been found to be poor in especially EL2 learners. OBJECTIVES: The purpose of this paper is to determine the effects of vowel perception and production intervention on phonemic awareness (PA) and literacy skills of Setswana first language (L1) learners. These learners are English second language (EL2) learners in Grade 3. METHOD: The present study employed a quasi-experimental, pre-test-post-test design. RESULTS: The findings of low-literacy skill levels concurred with previous investigations. However, post-test results of intervention in PA seemed to improve the literacy skills of EL2 learners. CONCLUSION: PA skills should be a crucial part of the literacy curriculum in South Africa.